i guest its 100ZX job to cover the back court. But instead, why did Yonex makes it less premium. Why dont they use the same Black Micro thing material, the same as 100ZZ with different BP or at least use the same old premium material like Nanometric so ZX will be in par with ZZ. If so, it will be new twins like 88D/88S. Front & back court combo. Or maybe they aim for single as targeted market, so they purposely kill ZX.